package com.atguigu.springcloud.lb.Impl;

import com.atguigu.springcloud.lb.LoadBalanced;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB implements LoadBalanced {

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndincrement()
    {
        int courrent;
        int next;
        do {
            courrent = this.atomicInteger.get();
            next = courrent >= 2147483647 ? 0 : courrent + 1;
        }
        while(!this.atomicInteger.compareAndSet(courrent,next));

        System.out.println("****第几次访问*next:"+next);

        return next;
    }
    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {

        int index = getAndincrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}
